Positron scattering from O2

Luca Chiari, Antonio Zecca, S Girardi, E Trainotti, Gustavo Garcia, Francisco Blanco, R McEachran, Michael Brunger

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    Abstract

    We report on recent cross section results for positron scattering from molecular oxygen (O 2). Total cross sections (TCSs) were measured with a positron spectrometer in the energy range from 0.1 to 50eV and with an energy resolution of the positron beam of 0.25eV. In addition, TCSs as well as elastic and inelastic integral cross sections were computed within the independent atom model and screening corrected additivity rule approach, with both dipole and dipole plus quadrupole polarization potentials, between 1 and 1000eV impact energy. An overall fair level of accord is found between the experimental TCS and that calculated with the model that includes the quadrupole term. Comparison to earlier measurements shows very good agreement with the present measured TCS and fair agreement with the TCS computed with our most physical model above 8eV. Conversely, we find only a marginal level of accord when comparing our experimental TCS with previous computations, while the present TCS calculated with the dipole plus quadrupole potentials appears to agree reasonably well with most of the existing theoretical results above 100eV.

    Original languageEnglish
    Article number215206
    Pages (from-to)215206-1-215206-9
    Number of pages9
    JournalJournal of Physics B-Atomic Molecular and Optical Physics
    Volume45
    Issue number21
    DOIs
    Publication statusPublished - 2012

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    Chiari, L., Zecca, A., Girardi, S., Trainotti, E., Garcia, G., Blanco, F., McEachran, R., & Brunger, M. (2012). Positron scattering from O2. Journal of Physics B-Atomic Molecular and Optical Physics, 45(21), 215206-1-215206-9. [215206]. https://doi.org/10.1088/0953-4075/45/21/215206